<template>
    <div class="type-nav">
            <div class="container">
								<div class="nav-left" @mouseenter="isHiddenNav=true" @mouseleave="handlerLeave">
									<h2 class="all">全部商品分类</h2>
									<div class="sort" v-show="isHiddenNav">
                    <div class="all-sort-list2" @click="btnSearch">
                        <div class="item" v-for="c1 in categoryList.slice(0,-2)" :key="c1.categoryId">
                            <h3>
                                <a data-level='1' :data-id='c1.categoryId' :data-name='c1.categoryName'>{{c1.categoryName}}</a>
                            </h3>
                            <div class="item-list clearfix">
                                <div class="subitem" v-for="c2 in c1.categoryChild" :key="c2.categoryId">
                                    <dl class="fore">
                                        <dt>
                                            <a data-level='2' :data-id='c2.categoryId' :data-name='c2.categoryName' >{{c2.categoryName}}</a>
                                        </dt>
                                        <dd>
                                            <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                                                <a data-level='3' :data-id='c3.categoryId' :data-name='c3.categoryName' >{{c3.categoryName}}</a>
                                            </em>
                                        </dd>
                                    </dl>
                                </div>
                            </div>
                        </div>    
                    </div>
                </div>
			</div>
                <nav class="nav">
                    <a href="###">服装城</a>
                    <a href="###">美妆馆</a>
                    <a href="###">尚品汇超市</a>
                    <a href="###">全球购</a>
                    <a href="###">闪购</a>
                    <a href="###">团购</a>
                    <a href="###">有趣</a>
                    <a href="###">秒杀</a>
                </nav>
            </div>
        </div>
</template>

<script>

    import {mapState} from 'vuex'

    export default {
        name:'NavPage',
        data() {
            return {
                isHiddenNav:false
            }
        },
        mounted() {
            // 如果当前是home 页面 则显示三级导航 否则不显示(home路由才有meta.isShowNav属性)
            if(this.$route.meta.isShowNav){
                this.isHiddenNav = true
            }
        },
        computed:{
            ...mapState('home',['categoryList'])
        },
        methods: {
            // 单击三级导航进行页面跳转
            btnSearch(e){
                const {level,id,name:categoryName} = e.target.dataset;

                if(!level) return // 如果单击的是空白位置 则不跳转 也不向下执行了
                
                // 法一：query 传参 接收参数的方法
                // 获取关键字  
                // const {keyword} = this.$route.query
                // 跳转到搜索页面时，拼接query参数
                // this.$router.push({
                //     name:'search',
                //     query:{
                //         keyword,
                //         categoryName,
                //         ['category'+level+'id']:id
                //     }
                // })

                // 法二： params + query 接收参数
                //  如果keyword是params参数 然后再拼接到地址栏中
                const { params } = this.$route;
                this.$router.push({
                    name:"search",
                    params,
                    query:{
                        categoryName,
                        ['category' + level + 'id']:id
                    }    
                })
            },

            // 鼠标离开
            handlerLeave(){
                // 如果下面条件成立 则代表此时在search页面 search 页面隐藏三级导航
                if(!this.$route.meta.isShowNav){
                    this.isHiddenNav = false
                }
            }
        },
    }
</script>

<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          &:hover{
            background-color: gainsboro;
            cursor: pointer;
          }
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>